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CVE-2026-31676— rxrpc: only handle RESPONSE during service challenge

CVSS 7.5 · High EPSS 0.06% · P18
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I. Basic Information for CVE-2026-31676

Vulnerability Information
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Vulnerability Title
rxrpc: only handle RESPONSE during service challenge
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: rxrpc: only handle RESPONSE during service challenge Only process RESPONSE packets while the service connection is still in RXRPC_CONN_SERVICE_CHALLENGING. Check that state under state_lock before running response verification and security initialization, then use a local secured flag to decide whether to queue the secured-connection work after the state transition. This keeps duplicate or late RESPONSE packets from re-running the setup path and removes the unlocked post-transition state test.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于rxrpc服务挑战状态中未正确检查状态，可能导致重复或延迟RESPONSE包重新执行设置路径。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux 17926a79320afa9b95df6b977b40cca6d8713cea ~ a6bcf8010af093fe04f7100562e9542ab7882585 -
LinuxLinux 2.6.22 -

II. Public POCs for CVE-2026-31676

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III. Intelligence Information for CVE-2026-31676

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Same Patch Batch · Linux · 2026-04-25 · 13 CVEs total

CVE-2026-316859.4 CRITICALnetfilter: ip6t_eui64: reject invalid MAC header for all packets
CVE-2026-316829.1 CRITICALbridge: br_nd_send: linearize skb before parsing ND options
CVE-2026-316837.8 HIGHbatman-adv: avoid OGM aggregation when skb tailroom is insufficient
CVE-2026-316807.8 HIGHnet: ipv6: flowlabel: defer exclusive option free until RCU teardown
CVE-2026-316787.8 HIGHopenvswitch: defer tunnel netdev_put to RCU release
CVE-2026-316757.8 HIGHnet/sched: sch_netem: fix out-of-bounds access in packet corruption
CVE-2026-316737.8 HIGHaf_unix: read UNIX_DIAG_VFS data under unix_state_lock
CVE-2026-316797.1 HIGHopenvswitch: validate MPLS set/set_masked payload length
CVE-2026-316747.1 HIGHnetfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check()
CVE-2026-31684net: sched: act_csum: validate nested VLAN headers
CVE-2026-31681netfilter: xt_multiport: validate range encoding in checkentry
CVE-2026-31677crypto: af_alg - limit RX SG extraction by receive buffer budget

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31676

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